"Every dog is at risk for getting heartworm disease, a potentially deadly condition. Fortunately, prevention is easy with Heartgard Plus (ivermectin/pyrantel), because dogs prefer the taste of these real beef chewables. Given once a month for life, Heartgard Plus helps ensure your pet has guaranteed protection from deadly heartworm disease. Heartgard Plus also treats and controls hookworms and roundworms. Heartgard Plus is well tolerated by most dogs. All dogs should be tested for heartworm infection before starting a preventive program."